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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd74ab121e44a0caaee788b22f8e6a0c5a5ba76f00d4a6b94b997bfaabeb98db5' 
  AND token = 'Kdx77YQjTHg30CaJ+7qEnYjeDtqMFUVfVrvQ1ZvTnbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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