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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '457d5d2dcd0d95beea2683234e8a5ac88a2ecd256a2f9d85e9e8872fa23b8060' 
  AND token = 'n3ml9dXeSC17oskqwRElknsuJNe76cAqtozGLFEkLvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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