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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4322524a2a0e471034df615bc1c2f8ae60ee1c31834d78a2084b2e8e8c6b3c1' 
  AND token = 'hWnrdkfnmrSJuTf4EIzIcEY/uyB/TM12wa8tMIoV8H0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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