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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efdec4c48391be2470247b192c27e1f71a73eb2ce0ef5a4fbc7b0c00012c2f53' 
  AND token = '3Bjl29516eBtFhSeC+AKnmpyduTedf87YWAzNkIfrSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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