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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23c73f0c0f230f0c37b45ba23044194564dfe027d106d82d9bdfe2c6e30d687d' 
  AND token = 's9JRrUbY/nMDaAt58+QzYocSAy8P0fTUtsLQkcvxe1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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