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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fb4c7d02fac1cf1e2545a9562bedb82168452a10a34986a9b02d09d46c070c9' 
  AND token = '8MwAOpubcrJ6r3aCL6dXRCDvpch6yvd4oAi2k9H501Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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