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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a8d9be7d494eb69d59b51f9beb35dd50a92d994d0715c2a091746f1cf4db934' 
  AND token = '5xCSryCpDADkfU9CX5GRCmD/dSN73z/XCa6dotpJN7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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