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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afeade92b94c35ac3de241be495133476d4d0916ca9a1aceeb97839047a06e0b' 
  AND token = 'IBrjVD68PGlWrukniDhMSc4WPtPyOXmRUjG8u56ZGvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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