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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91a5cbee8ac8baad1a2e585295cb0f0e5aaacf5da23898086de79d769a535953' 
  AND token = 'snMvFDV4AOhWZht9e+oCUdVx4HXUYMA+5SGP4sKCaQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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