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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0e2173b2eb9ea5b44fa6a4e83d79b7b613b0f28b814f15011582157e976736c' 
  AND token = 'axIa14fQajgmBaQOVdkdq2RaR9WjOoR+RVpxR2nxL+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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