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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56b6f0ffe5c7d17e0a9ce3f70dda0ba772064f13727064dc21b84a1dc96af54d' 
  AND token = 'orHhovrBNfZk4VPaDRoAeVm+UqgnzVF6thsONZczHjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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