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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1603759aaae145e21ecaa982ff4791427eb8ae0f0aa0728b84f6bebbd3082aeb' 
  AND token = 'qPrgquhQfLDy9WnWb9pvGNB2fIQhBx4tU23oz9fl0+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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