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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1deb6ab6a4433a5ac70b7dc2820814d01a65e72b277a65984402c70e6069e16d' 
  AND token = 'rjGgQhZGBbGxFd4uSDVE33+rzQl5zm2HjJk+cV7RjF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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