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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f6e93c30857c777bf64db865756d21d2e35f6db3764e5c9b3a0eef437507c5a' 
  AND token = '6JUfqc4bk6fGF6vYcYegK9HAfpnPiKKzUFWguC6pkJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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