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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fa852391b70df73243e6b0eddc65d82e43310805f293712557dae69b64a8394' 
  AND token = 'C/7EQ4No1jFOt5uhI4pv4o30kle0wwf7Op4gpFUqUx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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