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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '174d41f9b4c42ed439a607e18932a71b759638cda5907b0ce41651c9a93256ef' 
  AND token = 'CJocfUmoXOD8w6/xSgLT149zZJMC2VpQB1OgtgcG7Pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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