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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '069b16f4b4d422cf1c9c97e55d9cdc9eab9f01f28eaff18809a987e84e349de6' 
  AND token = 'IZGcVjMxDsWQQJa8M8sNUMD/Q8O6uMVSGEZUq3P1Pb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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