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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '885af6f7b9d2c9835c19b8b881d63f90911fa3827462d5d8ea14ef4526e18860' 
  AND token = 'q3Pc4/PSaj3SRhb3irIf6mo/SPyFjZvflkspQ7/8So8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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