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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fa0ce507d6149869a2b2a614430045b6a78d31262d39f195ba24436358cf0f3' 
  AND token = '/daa/jAV7YaoRWtL6u8sC/YCXAKSksuZNYNb6e0SsMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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