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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4906b45f58cfe48b4bf4d458411ad73ba27e55279b619d5b6a6263352ec230b2' 
  AND token = 'P/ErXTELN1hcYE+SBZZymSLnkzqPA8obN8oNmNHx51c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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