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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '516a38f5fda1088e27a62db547db72135cd555f67abe2bc38a0b58e7a4470b39' 
  AND token = 'LQzUiYmQAlQ5eAErvR5DjDtTVljHxZi9gY8rPLP5g7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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