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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '154ac50fc47cf53f86e744e249ae667e2ae174c85b257e1e4e0ed3a6eba07e5b' 
  AND token = 'erbIPltO5Y8heKbXNER5Pcg1Vs2Eky6w8gj+jWGBf/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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