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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05ab9b3d75940172089cc8dd0f4139e6cb7a28b1cd8e799753e642a900f018f1' 
  AND token = '6M41d9Xd4q1L6S1p/Zs8DjVnEMsKQmcenszju7XhrRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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