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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5aae470fd1175e999e8f3e41060000cc60c1dbfc7fff5b515f7ac8cc6455385' 
  AND token = '3AlWkaZqwR0+g1fvjUrE+j4hpmnlF59JQYwezkGhSuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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