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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b4167744ac2691bb611eac4959545e547cc82505edd54ef3d2edce3d5c27f1d' 
  AND token = '0gbd4xHMqKce0k1MZ9aj/hhcgr7MNOz1Gs965A9a464=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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