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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2692f763c42f89f4c6389889a066e4e8e54b2c19ada4759dde95bb6a2c6d377c' 
  AND token = '7gV3Hk01kE3rNHsLynQTV0Jc+BTvGgGJI5jaOT2bQ7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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