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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c5ff6dab83d923cd17de462c2e81a85dad24ba7aab1eefa519f9b41d02ae013' 
  AND token = '/BQP0xKAZX7pj3g0nEpSulZ5xVaf3j1OUa9rS/8zHK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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