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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc59d9b8f32182535f7c6b76fc483af01bc689be5f4dd5d376d262aea86cb4c8' 
  AND token = '3bAiR9AHAcJfqaAIasujHxp6OoksjJHOI3aOjMV+PhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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