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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea6e79b641874b1f50ad5f11ba944f8c045eaacbc341e49702a22f7b6f0eeef9' 
  AND token = 'xv/EG2lxJJQdItrXQB1/Zre1Bvk3wbC4mWkKx9K9t+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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