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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '308bb4d00197517bfe78328e6a5f79a4766f5c3d86c4f5f5879eb8e1f52e280a' 
  AND token = 'qdPQ51fpE115rnxWw9uCrtCQEy+dxcRIN8tLrbFIzIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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