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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd0e039945694c0bc3fb356014e11d7f39446678f118eae03b248b958ceeaf7e' 
  AND token = 'L1/vh/C0ySokL75vETb7hJ0PAGRA6gfAF1y1bOEFmL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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