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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c41120c16bd43a43ac4ed5cda52ca51a0f980bf4726c82e1263b42ac00d758f0' 
  AND token = 'KCx3rBudN2D1DSVe/2KNDxZg/cHqPehlj55S4iLVnxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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