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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70ac78b087e439b6245c69305ee2fe503aec0b671ea66113b81e4d1c4b3be425' 
  AND token = 'U91SJ0F+XuXTwwD1RLqSjT6RnDoK+/sCXey6DI9zLqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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