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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09aaf5f4aa60c26b5bc7f278e6055e431e48560a809981147144d73cf37fc6ee' 
  AND token = 'Lcc8Nhe2eVG6wCekxQENUtzon3aqYyIkj+650s/Y+m8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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