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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7b26bc9a6b295e711aaa25238ec2c94aec71bd05312be5bd3485edc9aee4aec' 
  AND token = 'TvV8U/7vwtIvQoj13qH0COPo0KxTKOPkk85clHWzsHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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