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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04a06956e3ddec82fb8d87c41be6dcd8c7eb275697c1856206e5169e19a006f8' 
  AND token = '4DWpsXdc9JhNzO5amCTi3UzJmAlinPd4vB4YP6NuqdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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