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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fae571ca871bf8931c79b30c8c4f3c5fe95a013cff956d73b81dec7959f8e332' 
  AND token = 'PQqg5ex8pBAnUXrK5s+HwdTgparQ7TlPwTpTyFPMp2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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