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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a07ff39be6033403344c0d9d7bb7f5fb99e99610897b0d43cadc7815f3ed8102' 
  AND token = 'mZ/2O0hghl2F3EMhULE1/6sYsS2MRi2JuyHOdEYuan4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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