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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e58223b35672ba4772790c0831671f704972acfd42526da5073cd3375f59db1' 
  AND token = 'vSJRRDkcYJbTm8VRo7q4LvCKG2qh6uEq7LKChbmAgfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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