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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ae01780bfc044a21547e0ec90b941e97e7c36f6238bc4f9c9bd1ff4de8d45cb' 
  AND token = 'YxDJTJRAoOCCdV/TgpuzyjbBVCnGaeHYgnrIUIER3po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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