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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ebdbd18acfbcfd9af4f5f3c01f727dddb20ddba69296e1f97200bf836a370f0' 
  AND token = 'ui22u5h3pkXmUEElu8B/5wlV+1lvHMwkTTICeN5wJRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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