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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ee8cb2bdb98244ba020155385145e903471a07f5ec29e56e32ce17d6ca089a5' 
  AND token = 'WPjS/i1vOzt724QJIxM2W1PfIL4dv5BdrykhRr/M/7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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