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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e314db0d8c87bf858ce928b2f0dd432dfa6fb1f012cf79d2a82ff9ee2d100d70' 
  AND token = 'ggisAwxf0y86oCKn8VGXsfz5IEuSCDsxcR6eraLxgQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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