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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91553dd181b0d2e2a639f8b516aeccbb57517a2d94b00d9d8fb9333d96e7937f' 
  AND token = '3NZNMe3SqiPg15xmpY+7d4HkKmx//dIYRDbRw0Qu+yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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