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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c72a0d9e98e4abff7ff6c59f9b21e48efb6e201d322143b57fab3b8b2cd37f7' 
  AND token = 'R0SdRkgoecv9rdYkLZ6dosbvwNe/uIfI0R5Q66vP/Ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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