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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2343a2e98b202a980ed1d07be95793843761b03673404e695abe2d29d7dd5f72' 
  AND token = '1MlXi7bPcdr3+2M962Ed6tCtIpS4KVtRakHFRlG+Cpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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