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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74f57ca427a49f29901ccbb74b5b15adadc9e57cbc55abab6697d4e8bccf5532' 
  AND token = 'MkeVgB4J5PbB4wQitsa9DNPBoCBDxsPmeFD8FLHrPp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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