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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf14ce897254ee7c943ecde3493a6ef9b051b25219293205f39c92cff949eb48' 
  AND token = 'Ogo8JhGfA3zACTPVvznleidKE0o5By5loTShc5Doxvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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