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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70632a5d9186f5c052b9ef46eb7040f5f1a2e7c52de4dddf54e3e0e267569e6c' 
  AND token = 'Y0cpEiudpc81Ui+IfoUqliwVhvIoTLPVx3M8SonSVu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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