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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '524b77e7a8bca6ef89db80c044b18aefb9b3498438f8884c7b55c84fda3837f2' 
  AND token = 'Tl3OibPG4bziKX0sekJ2FcXYRkeHBWyEdT2Qd5DemOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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