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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bf1f31cfd0d5568c60f08b2210a3c274b76203224e5a9b8ba414d6e6dc5b832' 
  AND token = '1cyyFLlM1eG0by84v3p6346Hh5XDJxjj8NtWGHcgg9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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