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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba8320aab1a7ea8a5caa3fdc52a082b25438d44bc0f24e6bc5514ec0305c78d0' 
  AND token = 'NXF97c1DpAvUgIgrvaSmafhVT6rVIjy8URQ87KUQ73Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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