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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b08684b4f1506590d56e2e4b9585d01b0031cf535fff8cec7d51d49286e6b7f3' 
  AND token = 'oCO264+eJpnNpEDOjyi/gWmqd1WGHQZ8cy7dqbHcG6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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