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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f220d330ea3a7230581b351c5f82331b04bca22a4ebd5b981ad3c055c0bc0840' 
  AND token = 'FvDZIwiVlzAwgMPVn4Pc2aJOza4p0hDW+27P7+tPhLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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