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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c25014a2f7a9ae596d4eb6d5d0a89e66693c06153b09652260583ebd0319f4fa' 
  AND token = '+x9gsZ4ThILEhWxzBFElAHYVRx8avkx/aoOglL/deVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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