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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd03c4e69fabc5168fbbe4d720b04bb5e5970ed02fc14cb958ed78c50928bd397' 
  AND token = 'VDoo9TjdExejuJjaoRiWfjzXF7J4PenE8S38PHeoO44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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