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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d13da53a7a81632318410d484a82b7a2ec77bf4989b9a98a9af93b98992ac6c' 
  AND token = 'yaDxNGmGhAKFRS9Fh/IlMMYsdSE0+5mQe1tiVIKLi/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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