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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e79474cb2cb2d58255ccdc00c3f1682826e80ef987b42a2d2ea1757eb02474b' 
  AND token = 'evYPb/dSkCpVQBnPOv/8madrO7lmAKlr9bB+AMI46T4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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