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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e155b2c15a17f0f95407470def7e02c0e1e4ee0d95b5a512e120ba385dd41c0d' 
  AND token = 't8PP85oTiZuAzy4RK+DOI1r8r94whTGtsQiRgz3m3UQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}