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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8999942a2faabcc74390eb2a376b70ca2687ff0c87271852dd917ed0586e1b8d' 
  AND token = 'E8lWf2FJrVreyrSLMO3A2/Nr5uLuopU56N0PLt6MsHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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