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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8db3279cd1b03662ae55e746ec4a8c4b271151ea750a8639a22efae62fc91779' 
  AND token = 'VoZYPXYPERCfSFhAEFBqDSyWEPmZOvhnB2aeaCL6KEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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