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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fcc82ca7935fc5daddabc6e66e2fc2a996b65ef685370961f3ac5474df3e89e' 
  AND token = '0zVrFpymZNz7Q3s76g0vwo99rzvy/VGM50NBYviPRqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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