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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9274378cf4b861c34600b88b143bb9277617cabb777da54e70320f98dd439274' 
  AND token = 'pfJI7bcMmGCqApnj3qJBFB4SwQViUvcbb0lF2V0fiGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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